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Mean of continuous variables observable {it via} measurement on single qubit

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arxiv quant-ph/0210163 v1 pith:5WYS3DA7 submitted 2002-10-23 quant-ph

Mean of continuous variables observable {it via} measurement on single qubit

classification quant-ph
keywords observablecontextdiscussedmeanmeasurementqubitsingleancilla
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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It is shown that mean value of any observable with bounded spectrum can be uniquely determined from binary statistics of the measurement performed on {\it single} qubit ancilla coupled to a given system. The observable structure is fully encoded in the corresponding POVM. The method is generalised to the case of distant labs paradigm and discussed in the context of entanglement detection with few local measurements. The results are also discussed in the context of quantum programming.

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